Rotary head for rotary engines.



- 1To.-8 3-3,698. PATENTED QGT. 16, 1906.

, N. R. SMITH & P. A. TALBOT.

ROTARYHEAD FOR. ROTARY ENGINES. APPLICATION FILED DEC. 19. 1905.

,4 Am WW I na/4. 7Z7 607 m /8. W4 AT URN Y UNITED STATES PATENT oFFIoE.

NORMAN n-sivhrii AND PAUL A. TALBOT, or SEATTLE, WASHINGTON, AS-

SIGNORS TO SEATTLE ROTARY ENGINE COMPANY, OF SEATTLE, WASH- INGTON, ACORPORATION WASHINGTON.

ROTARY HEAD To all whom, it may concern:

Be it known that we, NORMAN R. SMITH' and PAUL A. TALBOT, citizens ofthe United .States, and residents of the city of Seattle, in the countyof King and State of Washington, have invented certain new. and usefulImprovements in Rotary Heads for Rotary Engines, of which the followingis a specification. 1 7

Our invention .relates to improvements in the construction of the rotaryhead of the ro- .tary engine shown in the patentissued October 24, 1905,to Norman R. Smith, No.

802,828. r The object of our invention is to improve andsimplify theconstruction ofthis part of the engine. In thedrawings we show this inthe form which is now preferred by us.

Figure 1 is an end view of the rotary head. Fig. .2 is a partial sideview and partial section ofthe rotary head.

The general outline of the rotary head is that of a cylinder of across-section somewhat resembling an ellipse. This is divided on planeswhich are substantially perpendicular to the long diameter of theellipse into four principal parts 1, 2, 3, and 4.

One plane of division is that which includes the axis of revolution.This is indicated by the line 23. The other planes lie between this andthe respective ends of the long diameter. These are represented,respectively, by the lines 12 and 84. These latter lines of division arenot continuous planes, but each has a central section offset outwardlyto the line 5. Y

The outer lines of division correspond, essentially, to the location ofthe two valves. One of these valves is shown at 10, Fig. 2, and bydotted lines in Fig. 1. By dividing the head on these planes it is easyto finish the valve-seats truly.

The central line of division 23 permits of the insertion of therock-shaft by which the valves are shifted. This rock-shaft 6 is shownby dotted lines in Fig. 1 and has a central crank-arm 60, which whilenot exactly necessitating the central division makes it easier to insertit by reasonof this division.

The two central parts of the head are locked together by a key device ateach side of the shaft, which prevents their displacement laterally ofthe shaft-opening before it is placed on the shaft. We have shown thisin Fig. 1 as consisting of a rib or key 30, which Specification ofLetters Patent. Application filed December 19, 1905. Serial No. 292,489.

FOR ROTARY ENGINES.

Patented Oct. 16, 1906.

has been formed integrally of the part 3, and .a receiving-groove formedin the companion part 2. The key may, however, be separate from bothparts. u

The various parts are bound together into a rigid whole by means of twostraps 7, which are placed in channels recessed in" the end faces of thehead a short distance inward from its periphery. Each strap consists oftwo pieces of steel, each of which extends about half the head, wherethey overlap each other and are secured together andv drawn tight bytaper keys 8. The overlapping ends of these straps and the securing-keyas they would appear if seen from the side are shown in Fig. 2. Fromthisview the stra is reduced in thickness near its end and t en thickened toform a hook 17., These hooks pass by each other to form an opening forthe respectively, an acute and an obtuse angle withthe sides, whichtends to holdthe two ends from lateral separation. As a further guardagainstthis we have shown kesy 27, which fit seats formed, respectively,in the ends and in the adjacent surface of a shoulder formed in theother half of the strip.

The keys 8 are inserted in a hole which extends through the shell of thehead lying outside of the groove in which the shaft is placed. Centrallyof the head is an annular groove or recess 20, into which the inner endsof the keys project. This end is threaded and the keys are drawn tightby nuts thereon. This annular recess opens into the interior cavity ofthe head, which is used to receive the exhaust-steam, and the opening 20conducts this exhaust-steam to the exhaust-ports. The openings 30 arethe steam-supply ports and pass entirely through the rotary head.

Relative movement lengthwise the shaft between the parts 1 and 2 and theparts 3 and 4 is provided against by keys 15, which are embedded in eachin the contact-faces out- I00 side the ends of the valves. Relativemovement in the other direction is prevented by the offset between thefaces 5 and 12 and also by the beveled surfaces 13, extending inwardlyfrom the periphery of the rotary head. IO 5 out by spring or steampressure, as desired. no

. We have shown for this purpose a spring 16,

consisting of a flat barbent into awavy shape. The straps 7, whileapparently reduced in size where they overlap, are not really reducedbelow the section in the body thereof, as their width is increased inthe other direction. This method of constructing and assembl ing theparts forming the rotary head makes it easy to finish the valve-seatsand other like surfaces and makes a strong rigid structure whenassembled.

Having thus described our invention, what we claim, and desire to secureby Letters Pat- 1. A rotary head for rotary engines divided intoaplurality of fitting section's and ringlike straps peripherallyclamping and securing said "section's together. to form the completeheadl a i 2. Arotary head for rotary engines divided into a plurality ofparts having when assembled a groove or recess in each end faceextending about said face and within its periphery, and a strap in eachof said grooves binding the whole together. i i i w 3. A rotaryheadffo'r rotary. engines divided into a plurality of partshaving'whenassembled a groove extending just within the periphery in each'end face,binding-straps in eachof said grooves, and means for locking said partsto prevent sliding on their contactslfiffaces.

4. A rotary head for rotary engines divided into a plurality of parts byplanes extending in the same direction as the axis of rotation, said"parts having communicating grooves forming ring-like recesses in theirend faces and binding-straps in said grooves.

5. A rotary head for rotary engines divided n a p r l y of part h vi mmn ing grooves, binding-straps in said grooves and keys forjoining andtightening said straps.

6. A rotary head for rotary engines divided into a plurality of partshaving communicating grooves in their end faces just within theirperiphery, bindingstraps in said grooves and taper keys for joining andtightening said straps.

7 A rotary headfor-rotary engines, divided into a plurality of partshavingcOmmunioating grooves in their end faces, and bindingstraps insaid grooves, said straps having overlapping ends provided withhook-like ends, and locking-keys adapted to fit between the hook-facesof the overlapping ends.

8. A rotary head for rotary engines, divided into. a plurality of partshaving communicating grooves and binding straps in said grooves havingoverlapping hook-like ends, a locking-key fitting between the hook-facesof said ends andkeys engaging the outer faces of said ends and the bodyof the straps to prevent lateral displacement.

In testimony whereof we-have hereunto affixed our signatures, this 24thday of November, 1905, in the presence of two witnesses.

NORMAN R. SMITH. PAUL A. TALBOT. Witnesses:

GRosvENo FoLsoM, C. H. HARDEN.

